/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.catalina.ssi;

import java.io.PrintWriter;
import java.util.Collection;
import java.util.Iterator;

/**
 * Implements the Server-side #printenv command
 * 
 * @author Dan Sandberg
 * @author David Becker
 * @version $Id: SSIPrintenv.java 939518 2010-04-30 00:08:58Z kkolinko $
 */
public class SSIPrintenv implements SSICommand {
	/**
	 * @see SSICommand
	 */
	public long process(SSIMediator ssiMediator, String commandName,
			String[] paramNames, String[] paramValues, PrintWriter writer) {
		long lastModified = 0;
		// any arguments should produce an error
		if (paramNames.length > 0) {
			String errorMessage = ssiMediator.getConfigErrMsg();
			writer.write(errorMessage);
		} else {
			Collection variableNames = ssiMediator.getVariableNames();
			Iterator iter = variableNames.iterator();
			while (iter.hasNext()) {
				String variableName = (String) iter.next();
				String variableValue = ssiMediator
						.getVariableValue(variableName);
				// This shouldn't happen, since all the variable names must
				// have values
				if (variableValue == null) {
					variableValue = "(none)";
				}
				writer.write(variableName);
				writer.write('=');
				writer.write(variableValue);
				writer.write('\n');
				lastModified = System.currentTimeMillis();
			}
		}
		return lastModified;
	}
}
